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Commit 5a2fe38d authored by Olof Johansson's avatar Olof Johansson Committed by Paul Mackerras
Browse files

[POWERPC] powerpc: Reduce default cacheline size to 64 bytes 



Reduce default cacheline size on 64-bit powerpc from 128 bytes to 64.
This is the architected minimum. In most cases we'll still end up using
cache line information from the device tree, but defaults are used during
early boot and doing a few dcbst/icbi's too many there won't do any harm.

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent b7e89214

arch/powerpc/kernel/head_64.S

+1 −1
Original line number Diff line number Diff line
@@ -1748,7 +1748,7 @@ _STATIC(__after_prom_start) 
_GLOBAL(copy_and_flush)

	addi	r5,r5,-8

	addi	r6,r6,-8

4:	li	r0,16			/* Use the least common		*/

4:	li	r0,8			/* Use the smallest common	*/

					/* denominator cache line	*/

					/* size.  This results in	*/

					/* extra cache line flushes	*/

arch/powerpc/kernel/setup_64.c

+4 −4
Original line number Diff line number Diff line
@@ -78,10 +78,10 @@ u64 ppc64_pft_size; 
 * before we've read this from the device tree.

 */

struct ppc64_caches ppc64_caches = {

	.dline_size = 0x80,

	.log_dline_size = 7,

	.iline_size = 0x80,

	.log_iline_size = 7

	.dline_size = 0x40,

	.log_dline_size = 6,

	.iline_size = 0x40,

	.log_iline_size = 6

};

EXPORT_SYMBOL_GPL(ppc64_caches);